Bleaching Powder

Q.

Specify the oxidation state of Chlorine in ${\mathrm{CaOCl}}_2$.

Q.

Write the chemical formula of zinc acetate and antimony trioxide.

Q.

Why bleaching action of Chlorine is permanent while that of sulfur dioxide is temporary?

Q. Assertion: Oxidation state of hydrogen is +1 in $H_{2}O$ while -1 in $Ca{H}_2$.
Reason: $Ca{H}_2$ is a metal hydride and for hydrides, hydrogen is assigned the oxidation number of -1.

1. Assertion is true but Reason is false.
2. Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.
3. Both Assertion and Reason are false.
4. Both Assertion and Reason are true and Reason is the correct explanation for Assertion.

Q. A compound ${}^{\prime }{A}^{\prime }$ on reaction with ${}^{\prime }{X}^{\prime }$ and ${}^{\prime }{Y}^{\prime }$ produces the same major product but different by product ${}^{\prime }{a}^{\prime }$ and ${}^{\prime }{b}^{\prime }$. Oxidation of ${}^{\prime }{a}^{\prime }$ gives a substance produced by ants.



${}^{\prime }{X}^{\prime }$ and ${}^{\prime }{Y}^{\prime }$ respectively are

1. $KMn{O}_4/H^{+}$ and $dil.KMn{O}_4,273K$
2. $KMn{O}_4/H^{+}$ and $O_3,H_{2}O/Zn$
3. $O_3,H_{2}O/Zn$ and $KMn{O}_4/H^{+}$
4. $KMn{O}_4$(dilute), $273K$ and $KMn{O}_4/H^{+}$

Q. Auto-oxidation of bleaching powder yields:

1. $Ca(Cl{O}_3{)}_2$
2. $CaC{l}_2$
3. $Ca(OCl{)}_2$
4. Both a and b

Q.

Consider the following reaction at equilibrium. If some amount of argon gas is added to the reaction mixture at constant pressure then

${\mathrm{PCl}}_5\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{PCl}}_3\left(\mathrm{g}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)$

Q. $1.25g$ of bleaching powder when treated with acetic acid and excess of $KI$, liberated iodine which required $37.5mL$ of $0.2N$ sodium thiosulphate solution. Calculate the percentage of available chlorine in the sample of bleaching powder.

1. $30.0\%$
2. $21.3\%$
3. $12.5\%$
4. $9.7\%$

Q.

Is Washing Soda and Washing Powder the same thing?

Q.

Portland cement does not contain

1. 3CaO. SiO₂b

2. 2CaO.SiO₂c.

3. 3CaO.Al₂O₃

4. Ca₃(PO₄)₂

Q. Hydrogen peroxide can be prepared from:

1. 
2. NaOH
3. 
4. 

Q.

The Van Der Waal radius of oxygen nitrogen chlorine and fluorine is of the order??

Q.

Chlorine is not used in the preparation of:

1. Hydrochloric acid

2. Mustard gas

3. Tear gas

4. Phosgene

Q. 1.25 g sample of bleaching powder is dissolved in 100 mL of water and 25 mL of which is treated with $KI$ solution. The iodine so liberated required 12.5 mL of $\frac{N}{25}$ hypo solution. Find the percentage of chlorine available from the sample of bleaching powder

1. 5.68 %
2. 10.09 %
3. 15.31 %
4. 12.31 %

Q.

Write two uses of $Cl{O}_2$?

Q.

The color of Sulphur powder is:

1. Brown

2. Black

3. Yellow

4. Green

Q.

A sample of bleaching powder was kept in an air tight container. After a month, it lost some of its chlorine content. How will you account for it ?

Q.

The average oxidation state of Sulphur in Sodium Thiosulphate is +_____.

___

Q. With $C{r}_2{O}_3$, colour of the bead in sodium carbonate bead test:

1. 
   Red
2. 
   Blue
3. 
   Yellow
4. 
   Green

Q. 9.What is the chemical formula of SMOGE and SMOKE ?? What is the difference b/w these two, according to chemistry?

Q.

Name the ingredient used to make the cake porous and light.

Q. How to how to balance the equation by oxidation number method FeS2 + O2 ---------- Fe2O3 + SO2

Q. Iron oxide has formula Fe₀.₉₄O : What fraction of Fe exists as Fe⁺³ ?

Q. The oxidation state of $Cu$ and $Fe$ in Chalcopyrite is, respectively $+1$ and $+3$ ;

1. True
2. False

Q.

Which of the following represents the composition of carnalite mineral?

1. K₂O.Al₂O₃. 6SiO₂

2. KNO₃

3. K₂SO₄.MgSO₄.MgCl₂.6H₂O

4. KCl. MgCl₂ .6H₂O

Q. The statement about Dicholoromethane (Methylene chloride) that is not correct is

1. Direct contact with the eyes can burn the cornea.
2. Direct contact can cause​ burning and irritation of skin​
3. Indirect contact can cause​ damage to the central nervous system​
4. Indirect contact can cause dizziness, numbness, nausea

Q. The chemical formula of tear gas is :

1. $CO{Cl}_2$
2. $C{O}_2$
3. ${Cl}_2$
4. None of the above

Q.

On reacting ethene with HCl we get:

1. Chloroethane

2. Chloropropane

3. Chloromethane

4. None of these

Q. Dry slaked lime on reaction with chlorine gives

1. Pure anhydrous Calcium chloride
2. Bleaching powder
3. A combination of , dibasic Calcium hypochlorite - and dibasic Calcium Chloride - .
4. Both (A) and (C)

Q.

Why does river water contains lots of impurities?